Question

question 1 (1 point)
the form of energy entering into a process involving a transformation of energy is
useful output energy
energy intensity
energy efficiency
input energy
question 2 (1 point)
which of the following represents the largest amount of energy?
1 kwh
1 cal
1 j
1 cal

Explanation:

Question 1

To solve this, we analyze each option:

• "Useful output energy" is the energy obtained after transformation, not the one entering.
• "Energy intensity" relates to energy use per unit of activity, not input energy.
• "Energy efficiency" is the ratio of output to input energy, not the input itself.
• "Input energy" is defined as the energy that enters a process for transformation. So this matches the description.

Step1: Recall energy unit conversions

We know the following conversions:

• \( 1\ \text{kWh} = 3.6\times10^{6}\ \text{J} \)
• \( 1\ \text{Cal} = 1000\ \text{cal} \) and \( 1\ \text{cal} = 4.184\ \text{J} \), so \( 1\ \text{Cal} = 4184\ \text{J} \)
• \( 1\ \text{cal} = 4.184\ \text{J} \)
• \( 1\ \text{J} = 1\ \text{J} \)

Step2: Compare the values

• \( 1\ \text{kWh} = 3.6\times10^{6}\ \text{J} \)
• \( 1\ \text{Cal} = 4184\ \text{J} \)
• \( 1\ \text{J} = 1\ \text{J} \)
• \( 1\ \text{cal} = 4.184\ \text{J} \)

By comparing these values, \( 3.6\times10^{6}\ \text{J} \) (which is \( 1\ \text{kWh} \)) is the largest.

Answer:

D. input energy

Question 2